JDBC connection URI : jdbc:mysql://localhost:3306/communities?characterEncoding=UTF-8
specify server in place of localhost if MySQL server is not the same as 'this' AEM servercommunities is the default database (schema) name

Username : root
or enter the configured Username for the MySQL server, if not 'root'

Password :
clear this field if no password set for MySQL,
else enter the configured password for the MySQL Username

...

Datasource name : name entered for the MySQL connection, for example, 'communities'